Sofa bed with glide system

ABSTRACT

A sofa bed with three moving seat bases that transforms between a bed configuration and a sofa configuration. The sofa bed includes supporting legs and armrest. Each of the seat bases, and corresponding cushions, are located between the armrests. The seat bases are interconnected with a set of slide rails that allow the seat bases to move relative to one another. The sofa bed also includes a locking mechanism to hold the sofa bed in the sofa configuration.

CROSS REFERENCE TO RELATED APPLICATIONS

This application claims the priority benefit of Chinese Utility ModelPatent Application No. CN201922193208.0U filed on Dec. 9, 2019, nowChinese Utility Model Patent Grant No. CN211632507U.

FIELD OF THE INVENTION

The present invention relates to convertible furniture. Morespecifically, it relates to sofas that convert between sitting andsleeping configurations.

BACKGROUND OF THE INVENTION

Sofas are commonly sold as sitting furniture that allows more people tocomfortably sit side-by-side as compared to other furniture, such as anindividual chair. Sofas range in size from small two-person love seatsto large couches that can hold four or more people. Some sofas includemechanisms that allow the seat portion to unfold outward and forward toconvert into a bed. This combination is commonly called a “sleepersofa”, “stowaway sofa”, or “sofa bed”.

Sofa beds provide the convenience of a dual-purpose piece of furniture,and there are several kinds, each with their own sets of componentsassembled to realize a mechanism that switches the sofa bed between thesofa and bed configurations. These component assemblies mean that sofabeds may have complicated internal construction assemblies. Theseassemblies may be made up of metal tubes, attachments, and other metalmembers.

A shortcoming of existing sofa beds it that the internal assembliesresult in high manufacturing costs. Another shortcoming is that theinternal assemblies may weigh so much that the sofa bed is difficult tomove around or lift for the average person. Another shortcoming is thatthe internal assemblies may include so many components that they aresubject to easy damage or breakage. Further, the internal assemblies maybe difficult and costly to repair.

What is needed is a sofa bed that has a simplified internal assemblythat reliably transitions the sofa bed between the bed and sofaconfigurations. What is also needed is an internal assembly that islightweight so that the sofa can be easily moved. What is also needed isan internal assembly that is conducive to repair and resistant todamage.

SUMMARY OF THE DISCLOSURE

The present invention is an apparatus for use as a convertible sleepingand sitting surface. Specifically, the apparatus is a sofa bed with anenhanced glide apparatus for transitioning between the sofa and bedconfigurations.

One embodiment of the present disclosure is sofa bed that includes apair of armrests; at least one first seat cushion disposed between thepair of armrests; at least one first connector attached to each of theat least one first seat cushion; at least one second seat cushiondisposed between the pair of armrests; at least one second connectorattached to each of the at least one second seat cushion, wherein the atleast one first connector and the at least one second connector form ahinge joint; at least one third seat cushion disposed between the set ofarmrests; a first seat base attached to the at least one first seatcushion; a pair of stand bars supporting the first seat base; a secondseat base attached to the at least one second seat cushion; a third seatbase attached to the at least one third seat cushion, wherein the secondseat base and the third seat base are connected in a hinge joint; a pairof rotating shafts, each disposed in one of the armrests, wherein thethird seat base is attached to the rotating shafts opposite the hingejoint with the second seat base; a pair of support legs configured tosupport the second seat base; a pair of first slide rails, each attachedto one of the pair of support legs; a pair of first glide wheels, eachconnected to at least one of the first connectors, wherein each of thefirst slide rails is configured to receive the first glide wheel andallow it to roll along at least part of the length of the first slide; apair of second slide rails, each attached to one of the pair ofarmrests; and a pair of second glide wheels, each of the second glidewheels connected to one of the support legs, wherein each of the secondslides is configured to receive the second glide wheel and allow it toroll along at least part of the length of the second slide. The sofa bedmay also include a locking mechanism. Where the first seat base has aside distal to the second seat base and a side proximal to the secondseat base and the second seat base includes a protrusion opposite thesecond seat cushion, the locking mechanism may include a pair ofreinforcing rods, each with a first side and a second side, wherein theeach of the first sides is attached to the corresponding distal side ofthe first seat base and each of the second sides is attached to thecorresponding proximal side of the first seat base; a pair of ratchetbrackets, each comprising an L-shaped bar with a long side and shortside and comprising indentations along the long side, the short sidebeing attached to the reinforcing rod and the long side being attachedto the proximal side of the first seat base; a pair of locking rods,each with one end attached to the corresponding protrusion on the secondseat base and the other end engaging the teeth of the ratchet bracket;and a pair of slider stops, each surrounding a long side of one of theratchet brackets and comprising a spring between the slider stop and thelocking rod to apply force to maintain engagement between the teeth andthe locking rod. The sofa bed may also include a support pad disposed oneach of the first slides to support the second seat base and the thirdseat base. The sofa bed may also include a pair of first casters, eachon one of the stand bars; and a pair of second casters, each on one ofthe support legs. The third seat base may include a pair of connectionplates and each of the rotating shafts may connect to the third seatbase at one of the connection plates.

Examples of the more important features of the disclosure have beensummarized rather broadly in order that the detailed description thereofthat follows may be better understood and in order that thecontributions they represent to the art may be appreciated. There are,of course, additional features of the disclosure that will be describedhereinafter and which will form the subject of the claims appendedhereto.

BRIEF DESCRIPTION OF THE DRAWINGS

The organization and manner of the structure and operation of theinvention, together with further objects and advantages thereof, maybest be understood by reference to the following description taken inconnection with the accompanying drawings wherein like referencenumerals identify like elements in which:

FIG. 1 is a side view diagram of a sofa bed in a sofa configurationaccording to one embodiment of the present disclosure;

FIG. 2 is a side view diagram of the sofa bed of FIG. 1 in a bedconfiguration; and

FIG. 3 is an exploded view of the sofa bed of FIG. 1.

FIG. 4 is a side perspective view diagram of the sofa bed of FIG. 1 in abed configuration without cushions or armrests.

FIG. 5 is a side perspective view diagram of the sofa bed of FIG. 1.

FIG. 6 is a side view diagram of a clip of the sofa bed of FIG. 1.

FIG. 7 is a diagram of a locking system of the sofa bed of FIG. 1.

FIG. 8 is a side perspective view diagram of a locking system of FIG. 7attached to the sofa bed of FIG. 1 in a bed configuration.

FIG. 9 is a side perspective view diagram of a locking system of FIG. 7attached to the sofa bed of FIG. 1 in an intermediate configurationbetween sofa and bed.

FIG. 10 is a side view of a sofa bed provided in accordance with analternative preferred embodiment of the present invention.

FIG. 11 is a perspective view of a sofa bed provided in accordance withan alternative preferred embodiment of the present invention.

DETAILED DESCRIPTION OF THE DISCLOSURE

While this invention may be susceptible to embodiment in differentforms, specific embodiments are shown in the drawings and will bedescribed herein in detail with the understanding that the presentdisclosure is to be considered an exemplification of the principles ofthe invention and is not intended to limit the invention to that asillustrated.

FIGS. 1-3 show diagrams of the sofa bed 100 according to one embodimentof the present disclosure. FIG. 1 shows a side view of the sofa bed 100includes armrests 1, a first seat cushion 21, a second seat cushion 22,a third seat cushion 23, a first seat base 31, a second seat base 32 anda third seat base 33. The armrest 1 is constructed with an internalmetal frame that may be wrapped with foam and polyurethane leather orother suitable upholstery material. The armrests 1 are disposed on theleft and right sides of the sofa bed 100.

The parts of this disclosure may be discussed in singular or pairedfashion, as one side of the sofa bed 100 would be understood by a personof skill in the art to have symmetry between the parts on each side butmay have singular or paired parts between pairs of other parts. Forexample, a person of skill in the art would understand that a sofa hastwo armrests. Also, a person of skill in the art would understand that asofa may be designed to have a pair of cushions or a single longcushion.

The first seat cushion 21, the second seat cushion 22, and the thirdseat cushion 23 are disposed between the pair of armrests 1. The seatcushions 21, 22, 23 may be constructed of a plywood or metal base 31,32, 33 that is wrapped with foam and polyurethane leather. Each of thefirst seat base 31, the second seat base 32, and the third seat base 33correspond to one of the seat cushions 21, 22, 23. Each seat base 31,32, 33 is disposed on one side of corresponding seat cushion 21, 22, 23opposite from where a user would come in contact with the seat cushions21, 22, 23 during normal use of the sofa bed 100.

A first connector 51 is attached to the first seat cushion 21 and asecond connector 52 is attached to the second seat cushion 22. The firstconnector 51 and the second connector 52 are attached to each other by afastener that acts as a hinge 335 and allows the two connectors 51, 52to rotate relative to each other such that the first seat cushion 21 andthe second seat cushion 22 can move relative to one another to jointlyform a substantially planar surface in the bed configuration and atleast one of: an acute, right, or obtuse angle in sofa configuration aswould be understood by a person of skill in the art. Connectors 51, 52may comprise a crescent hinge.

The first seat base 31 may be made of metal. A reinforcing rod 34 may beattached to the first seat base 31. The reinforcing rod 34 may be bentor curved rather than straight. Each of the ends of the reinforcing rod34 may be connected proximate to or at the ends of the first seat base31. The reinforcing rod 34 may be made of metal as well.

The first seat base 31 may be supported by two stand bars 30. Each ofthe stand bars may be connected on one end to the first seat base 31 andhave a first caster 300 attached on the other end for contact with afloor surface, such that the first seat base 31 will roll on the floorwhen moved toward or away from the rest of the sofa bed 100. The firstseat base, viewed from the side, may be L-shaped. The short side of theL-shaped may be used as an attachment point for part of the ratchet orlocking system 500 discussed further below.

As with the first seat base 31, the second seat base 32 and the thirdseat base 33 may also be made of metal or another suitable material thatprovide structural support and attachment points for the othercomponents. A hinge 336 may connect the side of the second seat base 32distal from the first seat base 31 with one side of the third seat base33.

FIG. 3 shows an exploded side view of the sofa bed 100. The third seatbase 33 may include a hump or connection plate 331 on its underside anddistal from the second seat base 32 and hinge 336. The armrest 1 mayhave rotating shaft 11 or axle attached to it. The connection plate 331includes an opening through which part of the rotating shaft 11 may beinserted, such that the third seat base 33 can rotate about the rotatingshaft 11 and change its orientation relative to the armrest 1. As seenin FIG. 2, which is a side view of the sofa bed 100 in the bedconfiguration, the rotation of the seat bases 31, 32, 33 relative to oneanother on their respective hinges allows the sofa bed 100 to move fromthe sofa configuration to the bed configuration. The second seat cushion22 and the third seat cushion 23 that were facing in opposite directionsrelative to their seat bases 32, 33 from each other FIG. 1 are nowfacing in the same direction in FIG. 2. The rotating shaft 11 allows thethird seat cushion 23 to move relative to the armrest 1 by rotating butremain fixed at the point of the rotating shaft 11.

When shown in the sofa configuration, it can be seen that the sofa bed100 includes a system for sliding and locking the seat bases 31, 32, 33so that the sofa bed 10 can be transitioned between the sofaconfiguration and the bed configuration.

A support leg 40 may be attached to a first slide 41 and a second slide42. The support leg may be metal and L-shaped. A vertical portion of thesupport leg 40 may have a second caster 400 disposed on its end betweenthe support leg 40 and the floor surface. The first slide 41 is a sliderail attached to the top of the horizontal portion of the support leg40. A first glide wheel 211 may be attached to the first connector 51 ina position where the first glide wheel 211 is received by the firstslide 41 and can roll along with the first slide 41. A support pad 410may be disposed on top of the first slide 41 to support the second seatbase 32 and the third seat base 33 when the sofa bed 100 is in the bedconfiguration. The second slide 42 is a slide rail attached to thearmrest 1. The horizontal portion of the support leg 40 may have asecond glide wheel 401 disposed along its length that can roll along thelength of the second slide 42. In some embodiments, the second glidewheel 401 may be attached to the first slide 41.

The locking system 500 may include a ratchet bracket 61 with teeth 62, alocking rod 63, a slider stop 64, and first and second hinge joints 434,436. The ratchet bracket 61 may be metal and L-shaped, with the teeth 62disposed along the long part of the L. The teeth are made up ofindentations in the ratchet bracket 61 and define positions along thelength of the long side. One end of the ratchet bracket 61 is connectedto the reinforcing rod 34, and the other end is connected to the firstseat base 31. Alternative fastening mechanisms may be used.

The second seat base 32 includes a protrusion 332 on its undersideproximal to the first seat base 31. Similarly, the first seat base 31may include a protrusion or bracket to which first hinge joint 434 isconnected at the underside of base 31. The protrusion 332 includes anopening for forming a hinge joint 436. The locking rod 63 is a bentmetal bar with one end connected to the protrusion 332 at the hingejoint 436. The other end of the locking rod 63 is positioned to engageat least one of the teeth 62. The slider stop 64 is metal and surroundspart of the long side of the ratchet bracket 61. The slider stop 64 isconfigured to slide along one side of the ratchet bracket 61 and assistin the engagement of the locking rod 63 with the teeth 62. A spring 641is attached between the slider stop 64 and the end of the locking rod 63proximal to the slider stop 64. The force from the spring 641 holds thelocking rod 63 engaged with at least one of the teeth 62 unless acted onby another force.

FIGS. 4 and 5 shows sofa bed 100 without any cushions 21, 22, 23 orarmrests 1. As shown, the sofa bed 100 comprises first, second, andthird seat bases 31, 32, 33, stand bars 30, reinforcing rod 34, supportleg 40, first and second connectors 51, 52, ratchet bracket 61, clip420, backing support 422, vertical supports 424, lateral supports 426,armrest bracket 428 (which is attached to the armrest 1), box frame 430,and cross supports 432.

As shown in FIG. 6, the vertical supports 424 are complementary to thestand bars 30 and preferably extend from the first seat base 31 tolateral support 426 as shown in FIG. 4. The clip 420 is preferablyattached to the backing support 422 and/or the vertical supports 424using a suitable fastener. When the sofa bed 100 is in the sofaconfiguration, the clip 420 will deflect and lock on to strut orcrossbar 57 which helps to keep the sofa bed 100 in the sofaconfiguration. This is particularly useful for installations of sofa bed100 in moving vehicles, such as recreational vehicles, to keep the sofabed 100 from opening while the vehicle is in motion due to vibration andcomparable forces. Alternative fastening mechanisms may be used tomaintain the sofa bed 100 in the sofa configuration. The locking system500 may be spring loaded and thus biased toward the bed configuration.The crossbar 57 is preferably stationary.

As shown in FIGS. 7-9, the structure and function of the locking system500 is depicted including first hinge joint 434 connected to first seatbase 31 and second hinge joint 436 connected to second seat base 32.FIG. 8 shows the sofa bed 100 in the sofa configuration. In thisconfiguration, slider stop 64 is positioned toward first end 65. Whenthe sofa bed 100 is moved from the bed configuration to the sofaconfiguration, the slider stop will move along ratchet bracket 61 andteeth 62 toward second end 66, as shown in FIG. 9. Additionally, asratchet bracket 61 preferably moves in tandem with first and secondconnectors 51, 52, that is, as the sofa bed 100 is moved from bed tosofa configurations, and vice versa, the bracket 61 will move in tandemwith first and second connectors 51, 52. The first and second connectors51, 52 preferably rotate/slide past and do not interfere with each otheras the sofa bed 100 opens and closes. As best shown in FIG. 5, first andsecond connectors 51, 52 are preferably offset.

FIG. 10 shows alternative sofa bed 700, which is substantially the sameas sofa bed 100. The difference depicted in FIG. 10 is notch or gap 710,wherein the armrest 1 structure does not extend to the floor, as shownin FIG. 1. Notch 710 allows sofa bed 700 to be installed on a raisedand/or movable surface, such as a slide-out floor in a recreationalvehicle. The notch 710 may vary in height, preferably from 1 to 12inches for most applications, and, consequently, the lower-most heightof the mechanism of sofa bed 100, 700 is complementary to the height ofthe notch 710. Traditional sofa beds cannot comprise a notch 710 becausethe mechanism of such beds occupies the space of notch 710 because suchprior art mechanisms are installed near the bottom of the sofa (i.e.,substantially adjacent to the floor). In that way, the overall distancefrom the floor to the seat or bed of sofa bed 700 is reduced, ascompared to a sofa bed lacking the notch 710. This improves the safetyand accessibility of sofa bed 700, particularly in RV applications. Theoverall height of sofa bed 700 in RV installations may be adjusted,i.e., using different notch 710 sizes, spacers, or slide-out floorheights and/or elevations to accommodate a desired sofa bed 700 of auser.

FIG. 11 shows sofa bed 100 or 700, wherein third seat cushion 23, 730preferably extends to a position that is substantially flush with theback 740 of armrest 1, namely, the portion depicted in position againstor adjacent to wall 720 in FIG. 11. Like the notch 710, this feature isparticularly advantageous in RV applications where space is limited. Forexample, sofa bed 100, 700 may be installed against a wall 720 of an RV,wherein it is desirable for there to be no space wasted between the back740 and the wall 720 when the sofa bed 100, 700 is in the bedconfiguration as shown. Such installations are also applicable in smallspaces other than RVs.

In operation from the sofa configuration to the bed configuration, theseat base 31 may be lifted vertically by way of an optional handle 50 orsimilar device preferably connected to base 31 or backing support 422.FIG. 1 shows sofa bed 100 and base 31 in a slightly lifted position inpreparation for extension into the bed configuration. By lifting base31, the clip 420 is released from crossbar 57 and the sofa bed 100 mayextend from the sofa configuration shown in FIG. 1 to the bedconfiguration shown in FIG. 2. During deployment of the sofa bed 100into the bed configuration, the slider stop 64 will move along ratchetbracket 61 from the second end 66 toward the first end 65. Moreover, thecombination of rotating shaft 11, hinge 336, connectors 51, 52 incooperation with hinge 335, first glide wheel 211 in first slide 41,second glide wheel 401 in second slide 42 and preferably first andsecond casters 300, 400 enable the sofa bed 100 to smoothly glideoutwardly from a sofa configuration to a bed configuration as a userpulls gently on the handle 50. Additionally, locking rod 63 willgenerally coax the movement of second seat base 32 by way of theconnection of end 67 to second hinge joint 436. Once the sofa bed 100 isfully deployed in the bed configuration, the slider stop 64 will bepreferably disengaged from teeth 62.

To move the sofa bed 100 back into the sofa configuration, the seat base31 is preferably once again lifted vertically by way of an optionalhandle 50. This will engage the slider stop 64 with the teeth 62. Asbest shown in FIG. 9, movement toward the sofa configuration will causethe slider stop 64 to move toward end 66, as locking rod 63 pushesupwardly on second hinge joint 436 connected to protrusion 332 of secondseat base 32. As shown, this pushes second seat base 32 and third seatbase 33 into a substantially A-frame intermediate configuration, whereinthe third seat cushion 23 is substantially tucked away in the armrest 1,and second seat cushion 22 once again becomes a substantially verticalsupport surface for sitting, and first seat cushion 21 becomes asubstantially horizontal surface for sitting. When the sofa bed 100 isfully returned to the sofa configuration, the clip 420 will connect withcrossbar 57 and hold the sofa bed 100 in the sofa configuration untilbed deployment is once again desired.

As shown in the figures and described above, sofa bed 100, 700 providesnumerous advantageous and unique features over the prior art. A standardsofa bed has its mechanism placed beneath the seats of the sofa, and theseat cushions must be removed to open the metal mechanism. The mechanismof sofa bed 100, 700 is preferably not placed beneath the seat base 31;it actually includes the seat bases 31, 32, 33 and correspondingcushions 21, 22, 23 as part of the bed. Thus, the cushions 21, 22, 23 donot need to be removed and stored while the sofa bed 100, 700 is in usein any configuration. The sofa bed 100, 700 has first and second sets ofcasters or wheels 300, 400 that allow the sofa bed 100, 700 to be movedin a single continuous motion when it is open or closed. The back ofsofa bed 100, 700 is preferably a double-sided cushion 22, 23 mechanismthat allows it to fold flat to become part of the bed surface, as shownin FIGS. 1, 2. It is easy for anyone to use and does not require thecushions 21, 22, 23 to be removed. A traditional trifold sleeper has alarge fold down back “flap” that becomes a part of the mattress, but isharder to reach and fold back up, and it is one more step to operate ascompared to the advantageous sofa bed 100, 700. A traditional sofa bedmechanism is attached to the inside of the arms which takes up about8-10 inches of width on each side, thus reducing the sleeping space ofthe mattress or making the entire sofa width wider. As shown in thefigures, the sofa bed 100, 700 mechanism is attached very closely to theinside 750 of armrests 1 allowing for little clearance and a widersleeping and sitting surface 760 on a sofa bed 100, 700 that may have agreater ratio of surface 760 width to overall sofa bed 100, 700 width,as compared to such ratios of traditional sofa beds.

The sofa bed 100, 700 comprises the seat bases 31, 32, 33 that allextend and revert together as a single unit to form the sleep surface760. The back height 770 and sleep surface 760 of sofa bed 100, 700 canbe adjusted in production or by a user to fit tight areas. A standardsofa bed mechanism also requires about 12 inches of clearance from thesofa back to move upward for the mattress storage, whereas as the sofabed 100, 700 mechanism can be very close to the wall 720 at all times,thus allowing for a longer mattress that is closer to the wall 720 andconsequently conserves space as compared to traditional mattresses thatextend further into the space where the sofa bed is installed. Thisfeature of sofa bed 100, 700 is particularly advantageous in tightspaces such as RVs. The sofa bed 100, 700, has a built in “lock”position that keeps the unit from opening when it is in the seatconfiguration, the lock position being facilitated by the interaction ofthe clip 420 and strut 57. To open the sofa bed 100, 700 into the bedconfiguration, handle 50 may be grasped and the seat base 31 liftedupwardly a few inches such that the clip 420 and locking mechanism 500will release. The handle 50 may be lowered and gently pulled outwardly,such that the casters 300, 400 bear the weight of the sofa bed 100, 700as the sofa bed 100, 700 gently rolls out into the bed configuration. Toclose the sofa bed 100, 700, the handle 50 may be grasped again and thebase 31 lifted upwardly between preferably 1 to 10 inches from the floorto engage the locking mechanism 500. In normal operation, an audible“click” may be heard, indicating that the locking mechanism 500 isengaged. This will cause the adjacent edges of bases 32, 33 to moveupwardly as rod 63 pushes on base 32 toward an A-frame shape asdescribed above and shown in FIG. 9. The handle 50 may then be used topush the sofa bed 100, 700 inwardly until the base 31 becomes the seatand the base 32 becomes the backrest once more. When the sofa bed 100,700 approaches the complete sofa configuration, the clip 420 will onceagain engage the strut 57 and remain biased in the sofa configuration.

While embodiments in the present disclosure have been described in somedetail, according to the preferred embodiments illustrated above, it isnot meant to be limiting to modifications such as would be obvious tothose skilled in the art.

The foregoing disclosure and description of the disclosure areillustrative and explanatory thereof, and various changes in the detailsof the illustrated apparatus and system, and the construction and themethod of operation may be made without departing from the spirit of thedisclosure.

What is claimed is:
 1. A sofa bed comprising: a pair of armrests; atleast one first seat cushion disposed between the pair of armrests; atleast one first connector attached to each of the at least one firstseat cushion; at least one second seat cushion disposed between the pairof armrests; at least one second connector attached to each of the atleast one second seat cushion, wherein the at least one first connectorand the at least one second connector form a hinge joint; at least onethird seat cushion disposed between the set of armrests; a first seatbase attached to the at least one first seat cushion; a pair of standbars supporting the first seat base; a second seat base attached to theat least one second seat cushion; a third seat base attached to the atleast one third seat cushion, wherein the second seat base and the thirdseat base are connected in a hinge joint; a pair of rotating shafts,each disposed in one of the armrests, wherein that third seat base isattached to rotating shafts opposite the hinge joint with the secondseat base; a pair of support legs configured to support the first seatbase; a pair of first slide rails, each attached to one of the pair ofsupport legs; a pair of first glide wheels, each connected to one of thefirst connectors, wherein each of the first slides is configured toreceive the first glide wheel and allow it to roll along at least partof the length of the first slide; a pair of second slide rails, eachattached to one of the pair of armrests; and a pair of second glidewheels, each of the second glide wheels connected to one of the supportlegs, wherein each of the second slides is configured to receive thesecond glide wheel and allow it to roll along at least part of thelength of the second slide.
 2. The sofa bed of claim 1, wherein firstseat base has a side distal to the second seat base and a side proximalto the second seat base; and wherein the second seat base includes aprotrusion opposite the second seat cushion and further comprising: apair of reinforcing rods, each with a first side and a second side,wherein the each of the first sides is attached to the correspondingdistal side of the first seat base and each of the second sides isattached to the corresponding proximal side of the first seat base; apair of ratchet brackets, each comprising an L-shaped bar with a longside and short side and comprising indentations along the long side, theshort side being attached to the reinforcing rod and the long side beingattached to the proximal side of the first seat base; a pair of lockingrods, each with one end attached to the corresponding protrusion on thesecond seat base and the other end engaging the teeth of the ratchetbracket; and a pair of slider stops, each surrounding a long side of oneof the ratchet brackets and comprising a spring between the slider stopand the locking rod to apply force to maintain engagement between theteeth and the locking rod.
 3. The sofa bed of claim 1, furthercomprising: a support pad disposed on each of the first slides tosupport the second seat base and the third seat base.
 4. The sofa bed ofclaim 1, further comprising: a pair of first casters, each on one of thestand bars; and a pair of second casters, each on one of the supportlegs.
 5. The sofa bed of claim 1, wherein the third seat base comprisesa pair of connection plates and each of the rotating shafts connects tothe third seat base at one of the connection plates.
 6. The sofa bed ofclaim 1, further comprising a clip attached to the first seat base and astrut or crossbar, wherein the clip is configured to connect to thestrut and hold the sofa bed in a sofa position.
 7. A sofa bedcomprising: a pair of armrests; at least one first seat cushion disposedbetween the pair of armrests; at least one first connector attached toeach of the at least one first seat cushion; at least one second seatcushion disposed between the pair of armrests; at least one secondconnector attached to each of the at least one second seat cushion,wherein the at least one first connector and the at least one secondconnector form a hinge joint; at least one third seat cushion disposedbetween the set of armrests; a first seat base attached to the at leastone first seat cushion; a pair of stand bars supporting the first seatbase; a second seat base attached to the at least one second seatcushion; a third seat base attached to the at least one third seatcushion, wherein the second seat base and the third seat base areconnected in a hinge joint; a pair of rotating shafts, each disposed inone of the armrests, wherein that third seat base is attached torotating shafts opposite the hinge joint with the second seat base; apair of support legs configured to support the first seat base; a pairof first slide rails, each attached to one of the pair of support legs;a pair of first glide wheels, each connected to one of the firstconnectors, wherein each of the first slides is configured to receivethe first glide wheel and allow it to roll along at least part of thelength of the first slide; a pair of second slide rails, each attachedto one of the pair of armrests; and a pair of second glide wheels, eachof the second glide wheels connected to one of the first slides, whereineach of the second slides is configured to receive the second glidewheel and allow it to roll along at least part of the length of thesecond slide.
 8. The sofa bed of claim 6, wherein first seat base has aside distal to the second seat base and a side proximal to the secondseat base; and wherein the second seat base includes a protrusionopposite the second seat cushion and further comprising: a pair ofreinforcing rods, each with a first side and a second side, wherein theeach of the first sides is attached to the corresponding distal side ofthe first seat base and each of the second sides is attached to thecorresponding proximal side of the first seat base; a pair of ratchetbrackets, each comprising an L-shaped bar with a long side and shortside and comprising indentations along the long side, the short sidebeing attached to the reinforcing rod and the long side being attachedto the proximal side of the first seat base; a pair of locking rods,each with one end attached to the corresponding protrusion on the secondseat base and the other end engaging the teeth of the ratchet bracket;and a pair of slider stops, each surrounding a long side of one of theratchet brackets and comprising a spring between the slider stop and thelocking rod to apply force to maintain engagement between the teeth andthe locking rod.
 9. The sofa bed of claim 6, further comprising: asupport pad disposed on each of the first slides to support the secondseat base and the third seat base.
 10. The sofa bed of claim 6, furthercomprising: a pair of first casters, each on one of the stand bars; anda pair of second casters, each on one of the support legs.
 11. The sofabed of claim 6, wherein the third seat base comprises a pair ofconnection plates and each of the rotating shafts connects to the thirdseat base at one of the connection plates.
 12. The sofa bed of claim 6,further comprising a clip attached to the first seat base and a strut orcrossbar, wherein the clip is configured to connect to the strut andhold the sofa bed in a sofa position.